80 lines
1.5 KiB
C++
80 lines
1.5 KiB
C++
#include <psemek/gfx/effect/gamma.hpp>
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#include <psemek/gfx/program.hpp>
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#include <psemek/gfx/array.hpp>
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#include <psemek/gfx/error.hpp>
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namespace psemek::gfx
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{
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static char const gamma_vs[] =
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R"(#version 330
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const vec4 vertices[6] = vec4[6](
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vec4(-1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, 1.0, 0.0, 1.0),
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vec4(-1.0, -1.0, 0.0, 1.0),
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vec4( 1.0, 1.0, 0.0, 1.0),
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vec4(-1.0, 1.0, 0.0, 1.0)
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);
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out vec2 texcoord;
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void main()
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{
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gl_Position = vertices[gl_VertexID];
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texcoord = vertices[gl_VertexID].xy * 0.5 + vec2(0.5);
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}
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)";
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static char const gamma_fs[] =
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R"(#version 330
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uniform float u_gamma;
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uniform sampler2D u_input;
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in vec2 texcoord;
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out vec4 out_color;
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void main()
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{
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vec4 color = texture(u_input, texcoord);
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color.rgb = pow(color.rgb, vec3(u_gamma));
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out_color = color;
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}
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)";
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struct gamma_correction::impl
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{
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gfx::program program{gamma_vs, gamma_fs};
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gfx::array array;
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};
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gamma_correction::gamma_correction()
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: pimpl_{make_impl()}
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{
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impl().program.bind();
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impl().program["u_input"] = 0;
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}
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gamma_correction::~gamma_correction() = default;
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void gamma_correction::invoke(texture_2d const & src, render_target const & dst, options const & opts)
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{
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gl::Disable(gl::BLEND);
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gl::Disable(gl::DEPTH_TEST);
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gl::Disable(gl::CULL_FACE);
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dst.bind();
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gl::ActiveTexture(gl::TEXTURE0);
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src.bind();
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impl().array.bind();
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impl().program.bind();
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impl().program["u_gamma"] = opts.gamma;
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gl::DrawArrays(gl::TRIANGLES, 0, 6);
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}
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}
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